Eureka! In the late 19th century, $40 million worth of silver was extracted from the hills around Eureka. Pride of place goes to the county courthouse, with its handsome pressed-tin ceilings and walk-in vaults, and the beautifully restored opera house, also dating from 1880, which hosts an art gallery and summer folk-music concerts. The Eureka Sentinel Museum displays yesteryear newspaper technology and some colorful examples of period reportage. Budget motels and cafes line Main St.